US20020028329A1 - Light emitting element and azole compound - Google Patents
Light emitting element and azole compound Download PDFInfo
- Publication number
- US20020028329A1 US20020028329A1 US09/905,946 US90594601A US2002028329A1 US 20020028329 A1 US20020028329 A1 US 20020028329A1 US 90594601 A US90594601 A US 90594601A US 2002028329 A1 US2002028329 A1 US 2002028329A1
- Authority
- US
- United States
- Prior art keywords
- light emitting
- ring
- emitting element
- general formula
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- -1 azole compound Chemical class 0.000 title claims description 68
- KAESVJOAVNADME-UHFFFAOYSA-N 1H-pyrrole Natural products C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 161
- 230000005284 excitation Effects 0.000 claims abstract description 27
- 150000001875 compounds Chemical class 0.000 claims description 88
- 125000001424 substituent group Chemical group 0.000 claims description 73
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 55
- 238000000034 method Methods 0.000 claims description 54
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 36
- 239000011368 organic material Substances 0.000 claims description 31
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical group C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims description 19
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 17
- 125000001931 aliphatic group Chemical group 0.000 claims description 16
- 125000003373 pyrazinyl group Chemical group 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 6
- 229910052741 iridium Inorganic materials 0.000 claims description 4
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 4
- 238000004544 sputter deposition Methods 0.000 claims description 4
- 229910052723 transition metal Inorganic materials 0.000 claims description 4
- 150000003624 transition metals Chemical class 0.000 claims description 4
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims description 3
- 238000010894 electron beam technology Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 125000000609 carbazolyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3NC12)* 0.000 claims description 2
- 125000005266 diarylamine group Chemical group 0.000 claims description 2
- 125000005647 linker group Chemical group 0.000 claims 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims 2
- 238000009825 accumulation Methods 0.000 claims 1
- 229910052697 platinum Inorganic materials 0.000 claims 1
- 238000007740 vapor deposition Methods 0.000 claims 1
- 125000004432 carbon atom Chemical group C* 0.000 description 141
- 239000010410 layer Substances 0.000 description 131
- 125000003118 aryl group Chemical group 0.000 description 35
- 125000000217 alkyl group Chemical group 0.000 description 30
- 239000004793 Polystyrene Substances 0.000 description 23
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 23
- 229920002223 polystyrene Polymers 0.000 description 23
- KYQCOXFCLRTKLS-UHFFFAOYSA-N Pyrazine Chemical compound C1=CN=CC=N1 KYQCOXFCLRTKLS-UHFFFAOYSA-N 0.000 description 22
- 150000004945 aromatic hydrocarbons Chemical group 0.000 description 21
- 0 *#CC1=NC2=C(*(#C)=CC=C2)N1C1=[Y](C)C(N2C(*#C)=NC3=C2*(#C)=CC=C3)=[Y](C)C(N2C(*#C)=NC3=C2*(#C)=CC=C3)=[Y]1C.C#*C.C#*C.C#*C Chemical compound *#CC1=NC2=C(*(#C)=CC=C2)N1C1=[Y](C)C(N2C(*#C)=NC3=C2*(#C)=CC=C3)=[Y](C)C(N2C(*#C)=NC3=C2*(#C)=CC=C3)=[Y]1C.C#*C.C#*C.C#*C 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000002184 metal Substances 0.000 description 19
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Chemical group COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 19
- 125000000623 heterocyclic group Chemical group 0.000 description 17
- 230000008878 coupling Effects 0.000 description 15
- 238000010168 coupling process Methods 0.000 description 15
- 238000005859 coupling reaction Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 15
- PBMFSQRYOILNGV-UHFFFAOYSA-N pyridazine Chemical group C1=CC=NN=C1 PBMFSQRYOILNGV-UHFFFAOYSA-N 0.000 description 15
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical group C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 14
- 239000000203 mixture Substances 0.000 description 14
- 125000005843 halogen group Chemical group 0.000 description 13
- 125000002883 imidazolyl group Chemical group 0.000 description 13
- UGUHFDPGDQDVGX-UHFFFAOYSA-N 1,2,3-thiadiazole Chemical group C1=CSN=N1 UGUHFDPGDQDVGX-UHFFFAOYSA-N 0.000 description 12
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical group C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 12
- PCNDJXKNXGMECE-UHFFFAOYSA-N Phenazine Natural products C1=CC=CC2=NC3=CC=CC=C3N=C21 PCNDJXKNXGMECE-UHFFFAOYSA-N 0.000 description 12
- WCPAKWJPBJAGKN-UHFFFAOYSA-N oxadiazole Chemical group C1=CON=N1 WCPAKWJPBJAGKN-UHFFFAOYSA-N 0.000 description 12
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical group C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 10
- 125000003545 alkoxy group Chemical group 0.000 description 10
- 125000006615 aromatic heterocyclic group Chemical group 0.000 description 10
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical compound C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- 239000000956 alloy Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 9
- 125000000714 pyrimidinyl group Chemical group 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 8
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 8
- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 8
- 125000002971 oxazolyl group Chemical group 0.000 description 8
- 239000000758 substrate Substances 0.000 description 8
- 150000003852 triazoles Chemical group 0.000 description 8
- 125000004104 aryloxy group Chemical group 0.000 description 7
- 125000004429 atom Chemical group 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 7
- 239000010408 film Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 125000004857 imidazopyridinyl group Chemical group N1C(=NC2=C1C=CC=N2)* 0.000 description 7
- 238000005215 recombination Methods 0.000 description 7
- 230000006798 recombination Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- XSCHRSMBECNVNS-UHFFFAOYSA-N benzopyrazine Natural products N1=CC=NC2=CC=CC=C21 XSCHRSMBECNVNS-UHFFFAOYSA-N 0.000 description 6
- 125000004093 cyano group Chemical group *C#N 0.000 description 6
- 238000005401 electroluminescence Methods 0.000 description 6
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 6
- 229910044991 metal oxide Inorganic materials 0.000 description 6
- 150000004706 metal oxides Chemical class 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 125000000168 pyrrolyl group Chemical group 0.000 description 6
- 150000003536 tetrazoles Chemical group 0.000 description 6
- OZUCXGWYZVDFOU-UHFFFAOYSA-N 2-(diethylamino)ethyl 6-hydroxy-4,7-dimethoxy-1-benzofuran-5-carboxylate;hydrochloride Chemical compound [Cl-].CC[NH+](CC)CCOC(=O)C1=C(O)C(OC)=C2OC=CC2=C1OC OZUCXGWYZVDFOU-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 125000003342 alkenyl group Chemical group 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- 229930192474 thiophene Natural products 0.000 description 5
- 238000001771 vacuum deposition Methods 0.000 description 5
- ODIRBFFBCSTPTO-UHFFFAOYSA-N 1,3-selenazole Chemical group C1=C[se]C=N1 ODIRBFFBCSTPTO-UHFFFAOYSA-N 0.000 description 4
- PYWQACMPJZLKOQ-UHFFFAOYSA-N 1,3-tellurazole Chemical group [Te]1C=CN=C1 PYWQACMPJZLKOQ-UHFFFAOYSA-N 0.000 description 4
- 125000002252 acyl group Chemical group 0.000 description 4
- 125000004453 alkoxycarbonyl group Chemical group 0.000 description 4
- 125000004414 alkyl thio group Chemical group 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 125000003277 amino group Chemical group 0.000 description 4
- 125000004397 aminosulfonyl group Chemical group NS(=O)(=O)* 0.000 description 4
- 125000005161 aryl oxy carbonyl group Chemical group 0.000 description 4
- 125000005110 aryl thio group Chemical group 0.000 description 4
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 4
- 125000003917 carbamoyl group Chemical group [H]N([H])C(*)=O 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- VQGHOUODWALEFC-UHFFFAOYSA-N 2-phenylpyridine Chemical compound C1=CC=CC=C1C1=CC=CC=N1 VQGHOUODWALEFC-UHFFFAOYSA-N 0.000 description 3
- KDCGOANMDULRCW-UHFFFAOYSA-N 7H-purine Chemical group N1=CNC2=NC=NC2=C1 KDCGOANMDULRCW-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- ZCQWOFVYLHDMMC-UHFFFAOYSA-N Oxazole Chemical compound C1=COC=N1 ZCQWOFVYLHDMMC-UHFFFAOYSA-N 0.000 description 3
- WTKZEGDFNFYCGP-UHFFFAOYSA-N Pyrazole Chemical compound C=1C=NNC=1 WTKZEGDFNFYCGP-UHFFFAOYSA-N 0.000 description 3
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 125000004442 acylamino group Chemical group 0.000 description 3
- 125000004423 acyloxy group Chemical group 0.000 description 3
- 125000000304 alkynyl group Chemical group 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000003618 dip coating Methods 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 230000005283 ground state Effects 0.000 description 3
- 125000001041 indolyl group Chemical group 0.000 description 3
- 150000002503 iridium Chemical class 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 125000002950 monocyclic group Chemical group 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004528 spin coating Methods 0.000 description 3
- 125000006296 sulfonyl amino group Chemical group [H]N(*)S(*)(=O)=O 0.000 description 3
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 3
- 125000004434 sulfur atom Chemical group 0.000 description 3
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- BCMCBBGGLRIHSE-UHFFFAOYSA-N 1,3-benzoxazole Chemical compound C1=CC=C2OC=NC2=C1 BCMCBBGGLRIHSE-UHFFFAOYSA-N 0.000 description 2
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 2
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 2
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- DZBUGLKDJFMEHC-UHFFFAOYSA-N acridine Chemical compound C1=CC=CC2=CC3=CC=CC=C3N=C21 DZBUGLKDJFMEHC-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 125000004466 alkoxycarbonylamino group Chemical group 0.000 description 2
- 125000005162 aryl oxy carbonyl amino group Chemical group 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 2
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
- 229940093499 ethyl acetate Drugs 0.000 description 2
- 235000019439 ethyl acetate Nutrition 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 150000008376 fluorenones Chemical class 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 150000002222 fluorine compounds Chemical class 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 150000002460 imidazoles Chemical class 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 229940079865 intestinal antiinfectives imidazole derivative Drugs 0.000 description 2
- 238000007733 ion plating Methods 0.000 description 2
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- AWJUIBRHMBBTKR-UHFFFAOYSA-N isoquinoline Chemical compound C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 2
- ZLTPDFXIESTBQG-UHFFFAOYSA-N isothiazole Chemical compound C=1C=NSC=1 ZLTPDFXIESTBQG-UHFFFAOYSA-N 0.000 description 2
- CTAPFRYPJLPFDF-UHFFFAOYSA-N isoxazole Chemical compound C=1C=NOC=1 CTAPFRYPJLPFDF-UHFFFAOYSA-N 0.000 description 2
- 239000011133 lead Substances 0.000 description 2
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 2
- 238000001451 molecular beam epitaxy Methods 0.000 description 2
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- 230000003287 optical effect Effects 0.000 description 2
- 150000004866 oxadiazoles Chemical class 0.000 description 2
- CQDAMYNQINDRQC-UHFFFAOYSA-N oxatriazole Chemical group C1=NN=NO1 CQDAMYNQINDRQC-UHFFFAOYSA-N 0.000 description 2
- 150000007978 oxazole derivatives Chemical class 0.000 description 2
- KJIFKLIQANRMOU-UHFFFAOYSA-N oxidanium;4-methylbenzenesulfonate Chemical compound O.CC1=CC=C(S(O)(=O)=O)C=C1 KJIFKLIQANRMOU-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 125000006678 phenoxycarbonyl group Chemical group 0.000 description 2
- 238000001296 phosphorescence spectrum Methods 0.000 description 2
- LFSXCDWNBUNEEM-UHFFFAOYSA-N phthalazine Chemical compound C1=NN=CC2=CC=CC=C21 LFSXCDWNBUNEEM-UHFFFAOYSA-N 0.000 description 2
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical class N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 2
- 150000003057 platinum Chemical class 0.000 description 2
- 229920003227 poly(N-vinyl carbazole) Polymers 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920000123 polythiophene Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- JWVCLYRUEFBMGU-UHFFFAOYSA-N quinazoline Chemical compound N1=CN=CC2=CC=CC=C21 JWVCLYRUEFBMGU-UHFFFAOYSA-N 0.000 description 2
- MABNMNVCOAICNO-UHFFFAOYSA-N selenophene Chemical compound C=1C=C[se]C=1 MABNMNVCOAICNO-UHFFFAOYSA-N 0.000 description 2
- 238000010898 silica gel chromatography Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 125000003808 silyl group Chemical group [H][Si]([H])([H])[*] 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- 239000005361 soda-lime glass Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229940042055 systemic antimycotics triazole derivative Drugs 0.000 description 2
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- 229920001721 polyimide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 150000004033 porphyrin derivatives Chemical class 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- CPNGPNLZQNNVQM-UHFFFAOYSA-N pteridine Chemical compound N1=CN=CC2=NC=CN=C21 CPNGPNLZQNNVQM-UHFFFAOYSA-N 0.000 description 1
- 125000000561 purinyl group Chemical group N1=C(N=C2N=CNC2=C1)* 0.000 description 1
- JEXVQSWXXUJEMA-UHFFFAOYSA-N pyrazol-3-one Chemical class O=C1C=CN=N1 JEXVQSWXXUJEMA-UHFFFAOYSA-N 0.000 description 1
- 150000003219 pyrazolines Chemical class 0.000 description 1
- 125000003226 pyrazolyl group Chemical group 0.000 description 1
- 125000002098 pyridazinyl group Chemical group 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000005554 pyridyloxy group Chemical group 0.000 description 1
- 125000005030 pyridylthio group Chemical group N1=C(C=CC=C1)S* 0.000 description 1
- 238000006862 quantum yield reaction Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical class C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000005546 reactive sputtering Methods 0.000 description 1
- WPFGFHJALYCVMO-UHFFFAOYSA-L rubidium carbonate Chemical compound [Rb+].[Rb+].[O-]C([O-])=O WPFGFHJALYCVMO-UHFFFAOYSA-L 0.000 description 1
- 229910000026 rubidium carbonate Inorganic materials 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 125000004469 siloxy group Chemical group [SiH3]O* 0.000 description 1
- 239000010944 silver (metal) Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- PJANXHGTPQOBST-UHFFFAOYSA-N stilbene Chemical class C=1C=CC=CC=1C=CC1=CC=CC=C1 PJANXHGTPQOBST-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000000213 sulfino group Chemical group [H]OS(*)=O 0.000 description 1
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Inorganic materials O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 1
- TULWUZJYDBGXMY-UHFFFAOYSA-N tellurophene Chemical group [Te]1C=CC=C1 TULWUZJYDBGXMY-UHFFFAOYSA-N 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 125000001113 thiadiazolyl group Chemical group 0.000 description 1
- CBDKQYKMCICBOF-UHFFFAOYSA-N thiazoline Chemical compound C1CN=CS1 CBDKQYKMCICBOF-UHFFFAOYSA-N 0.000 description 1
- 125000000335 thiazolyl group Chemical group 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 125000005297 thienyloxy group Chemical group S1C(=CC=C1)O* 0.000 description 1
- 125000004149 thio group Chemical group *S* 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 150000003918 triazines Chemical class 0.000 description 1
- 125000004306 triazinyl group Chemical group 0.000 description 1
- 125000003866 trichloromethyl group Chemical group ClC(Cl)(Cl)* 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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- H10K85/342—Transition metal complexes, e.g. Ru(II)polypyridine complexes comprising iridium
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- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/10—Transparent electrodes, e.g. using graphene
- H10K2102/101—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO]
- H10K2102/103—Transparent electrodes, e.g. using graphene comprising transparent conductive oxides [TCO] comprising indium oxides, e.g. ITO
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- H10K85/114—Poly-phenylenevinylene; Derivatives thereof
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- H10K85/30—Coordination compounds
- H10K85/321—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
- H10K85/322—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising boron
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- H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
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- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/636—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
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- H10K85/656—Aromatic compounds comprising a hetero atom comprising two or more different heteroatoms per ring
- H10K85/6565—Oxadiazole compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/917—Electroluminescent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to a light emitting element and an azole compound used therefore, and, more particularly, to a light emitting element which can be utilized in a wide range of fields such as back lights, flat panel displays, illuminating light sources, display elements, electrophotographs, organic semiconductor lasers, recording light sources, exposure light sources, read light sources, beacons, signboards, interiors and optical communication devices.
- organic electroluminescence (EL) elements have been animatedly studied and developed in recent years because these organic electroluminescence elements enable high luminance emission to be obtained even when driven at low voltages.
- An organic EL element is generally structured of a light emitting layer and a pair of counter electrodes between which the light emitting layer is sandwiched, and makes use of emission from an exciton produced by recombination of an electron injected from a cathode with a hole injected from an anode in the light emitting layer.
- organic EL elements which emit high illuminance light at low voltages at present, those having a multilayer structure as revealed by Tang et al. (Applied Physics Letters, vol. 51, page 913, 1987) are known.
- This element can emit high illuminance green light by lamination of a material which doubles as an electron transporting material and a light emitting material with a hole transporting material, wherein the illuminance reaches several thousands cd/m 2 at a d.c. voltage of 6 to 7 V.
- further improvement in the illuminance and development of more highly efficient light emitting elements are desired, taking practical elements into consideration.
- organic light emitting elements those which have attained high illuminance emission are elements with multilayered structure of organic materials by vacuum deposition.
- Production of elements by using a coating method is preferable in view of simplification of production steps, processability and increase in area.
- elements produced by a conventional coating method are inferior to elements produced by a deposition system in emission illuminance and luminance efficiency, giving rise to important problems concerning high illuminance and high luminance efficiency in view of the simplification of production steps, processability, area increase and the like.
- the present invention has been made in view of the above various problems and it is an object of the present invention to provide a light emitting element which can emit light in the blue region with high luminance efficiency, and a light emitting element which can emit light of white of high color purity with high luminance efficiency.
- the present invention provides a light emitting element comprising at least a light emitting layer containing a light emitting material and a host material and having a light emission maximum wavelength of 500 nm or less wherein the minimum excitation triplet energy level of the above host material is higher than the minimum excitation triplet energy level of the above light emitting material.
- the above light emitting layer is held between a pair of electrodes and an electric field is applied to the electrodes whereby electrons are injected from a cathode and holes are injected from an anode. These electrons and holes are recombined with each other in the light emitting layer to create triplet excitons. When an exciton returns to the ground state, excess energy is emitted as light in the blue region.
- the above light emitting layer is composed of a light emitting material (guest material) and a host material having a minimum excitation triplet energy level (T 1 ) higher than the T 1 of the light emitting material. This makes it possible to transfer the energy of the above triplet exciton to the T 1 level of the light emitting material efficiently, with the result that blue light can be emitted with high luminance efficiency.
- the minimum excitation triplet energy level of the host material is preferably from 1.05 times to 1.38 times the minimum excitation triplet energy level of the light emitting material. Further, the minimum excitation triplet energy level of said host material is preferably from 68 kcal/mol (284.9 kJ/mol) to 90 kcal/mol (377.1 kJ/mol).
- the host material is preferably a compound represented by the following general formula (I):
- L 1 represents a bivalent or more coupling group
- Q 1 represents an aromatic hydrocarbon ring or an aromatic hetero ring
- n 1 represents a number of 2 or more, plural Q 1 may be the same or may be different from each other.
- the above object can be achieved by provision of a light emitting element comprising at least a light emitting layer containing a light emitting material and a host material and a layer which is disposed adjacent to the light emitting layer and contains an organic material wherein the minimum excitation triplet energy level of the above organic material is higher than the minimum excitation triplet energy level of each of materials which constitute the light emitting layer.
- the above light emitting layer and the layer disposed adjacent to the light emitting layer are held between a pair of electrodes and an electric field is applied to the electrodes whereby electrons are injected from a cathode and holes are injected from an anode. These electrons and holes are recombined with each other in the light emitting layer to create triplet excitons. When the exciton returns to the ground state, excess energy is emitted as light in the blue region.
- the layer disposed adjacent to the above light emitting layer is composed of an organic material having a minimum excitation triplet energy level (T 1 ) higher than the T 1 of each of the light emitting material and the host material. This makes it possible to prevent transfer of the energy of the above triplet exciton which is generated in the light emitting layer to the organic material which constitutes the layer disposed adjacent to the light emitting layer, with the result that blue light can be emitted with high luminance efficiency.
- the minimum excitation triplet energy level of the organic material contained in the layer which is disposed adjacent to the light emitting layer is from 1.05 times to 1.38 times the minimum excitation triplet energy level of the light emitting material. Further, the minimum excitation triplet energy level of the organic material is 68 kcal/mol (284.9 kJ/mol) or more and 90 kcal/mol (377.1 kJ/mol) or less.
- the organic material contained in the layer which is disposed adjacent to the light emitting layer is preferably a compound represented by the following general formula (II):
- L 2 represents a bivalent or more coupling group
- Q 2 represents an aromatic hydrocarbon ring or an aromatic hetero ring
- n 2 represents a number of 2 or more, plural Q 2 may be the same or may be different from each other.
- the azole compound represented by the following general formula (A) is preferably used as the organic material.
- R A1 , R A2 , and R A3 each represent a hydrogen atom or an aliphatic hydrocarbon group; R A4 , R A5 , and R A6 each represent a substituent; n A1 , n A2 , and n A3 each represents an integer of 0 to 3; X A1 , X A2 , and X A3 each represent a nitrogen atom or C—R X (R X represents a hydrogen atom or a substituent) ; and Y A1 , Y A2 , and Y A3 each represent a nitrogen atom or C—R YX (R YX represents a hydrogen atom or a substituent).
- a light emitting element comprises at least a light emitting layer containing a light emitting material.
- a light emitting layer is generally held between a pair of electrodes which are an anode and a cathode.
- a hole injecting layer, a hole transporting layer, an electron injecting layer, an electron transporting layer, a protective layer and the like may be disposed between the pair of electrodes, and these layers may be provided with other functions respectively.
- the light emitting element of the present invention is preferably an organic light emitting element.
- the organic light emitting element referred to herein means an element in which a material which emits light is an organic compound.
- the light emitting element of the present invention has a light emission maximum wavelength ⁇ max of 500 nm or less, specifically this light emitting element is a blue light emitting element.
- the above ⁇ max is preferably 495 nm or less and more preferably 490 nm or less in view of color purity.
- the light emitting element of the present invention may emit light in any of regions other than the blue region, such as the ultraviolet region, green region, red region, and infrared region.
- the light emitting element of the present invention preferably has a high luminance efficiency.
- External quantum efficiency of the light emitting element is 5% or more, preferably 7% or more, more preferably 10% or more, still more preferably 18% or more.
- the external quantum efficiency means a value calculated from the following formula.
- Methods of calculating an external quantum efficiency include a method of calculating from the emission illuminance, emission spectrum, relative luminance efficiency curve and current density and a method of calculating the current density and the total number of emitted photons.
- the light emitting element of the present invention is a light emitting element having a light emission maximum wavelength of 500 nm or less, in which the light emitting layer contains a host material and a light emitting material (guest material) and the T 1 level of the host material is higher than the T 1 level of the light emitting material.
- the light emitting layer contains a host material and a light emitting material (guest material) and the T 1 level of the host material is higher than the T 1 level of the light emitting material.
- the light emitting element according to the present invention preferably comprises a layer disposed adjacent to the light emitting layer, and the T 1 level of an organic material contained in the layer adjacent to the light emitting layer is higher than the T 1 level of each of the materials which constitute the light emitting layer.
- the layer adjacent to the light emitting layer include a hole injecting layer, hole transporting layer, electron injecting layer, electron transporting layer, hole blocking layer, and electron blocking layer.
- the organic material which is used in each layer include a hole injecting material, hole transporting material, electron injecting material, electron transporting material, hole blocking material and electron blocking material. In a case where two layers are disposed adjacent to the light emitting layer, both these layers are preferably formed of an organic material having a T 1 level higher than the T 1 level of the light emitting material.
- the luminance efficiency of a light emitting element can be expressed by a product of an injection efficiency of a hole and an electron, a recombination efficiency of a hole and an electron, a generation efficiency of an exciton, an efficiency of transfer of excitation energy generated by the recombination to the light emitting material, and a luminous quantum efficiency of the light emitting material.
- a material which emits light from a triplet exciton is used as the light emitting material, the probability at which the exciton is generated by the recombination, is higher than that of a singlet exciton, thereby resulting in improvement of the luminance efficiency.
- the luminance efficiency further improves.
- the T 1 level of the host material is made higher than the T 1 level of the light emitting material, thereby enabling efficient transfer of the energy of the triplet exciton to the T 1 level of the light emitting material, with the result that light is emitted with high luminance efficiency.
- the T 1 level of the organic material constituting the layer disposed adjacent to the light emitting layer is made higher than the T 1 level of the light emitting material to thereby prevent the energy of the triplet exciton from transferring to the organic material constituting the layer adjacent to the light emitting layer, with the result that light is emitted with high luminance efficiency.
- the T 1 level of each of the host material and the organic material contained in the layer which is disposed adjacent to the light emitting layer is preferably 1.05 times to 1.38 times the T 1 level of the light emitting material.
- the T 1 level of each of the host material and the organic material is preferably from 68 kcal/mol (284.9 kJ/mol) to 90 kcal/mol (377.1 kJ/mol), more preferably from 69 kcal/mol (289.1 kJ/mol) to 85 kcal/mol (356.2 kJ/mol) and still more preferably 70 kcal/mol (293.3 kJ/mol) to 80 kcal/mol (335.2 kJ/mol).
- the T 1 level of the organic material is also higher than the T 1 level of the light emitting material.
- a more preferable embodiment of the light emitting element of the present invention is a light emitting element in which the T 1 level of any organic material contained in any layer is higher than the T 1 level of the light emitting material.
- the host material is preferably a compound represented by the following general formula (I), and the organic material which constitutes the layer adjacent to the light emitting layer is preferably a compound represented by the following general formula (II).
- L 1 represents a bivalent or more coupling group
- Q 1 represents an aromatic hydrocarbon ring or an aromatic hetero ring
- n 1 represent a number of 2 or more.
- Plural Q 1 may be the same or may be different from one another.
- L 2 represents a bivalent or more coupling group
- Q 2 represents an aromatic hydrocarbon ring or an aromatic hetero ring
- n 2 represent a number of 2 or more.
- Plural Q 2 may be the same or may be different from one another.
- L 2 , Q 2 , and n 2 each has the same meaning as L 1 , Q 1 , and n 1 in the general formula (I), and a duplicate description thereof will be omitted.
- L 1 represents a bivalent or more coupling group, preferably a coupling group comprised of carbon, silicon, nitrogen, boron, oxygen, sulfur, metal, and metal ion, more preferably a carbon atom, a nitrogen atom, a silicon atom, a boron atom, an oxygen atom, a sulfur atom, an aromatic hydrocarbon ring, and an aromatic hetero ring, and still more preferably a carbon atom, a silicon atom, an aromatic hydrocarbon ring, and an aromatic hetero ring.
- Specific examples of the coupling group represented by L 1 include the following.
- L 1 may have a substituent.
- substituents include an alkyl group (preferably having from 1 to 20 carbon atoms, more preferably having from 1 to 12 carbon atoms, and particularly preferably having from 1 to 8 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-octyl, cyclopropyl, cyclopentyl, cyclohexyl, trifluoromethyl, and trichloromethyl), an alkenyl group (preferably having from 2 to 20 carbon atoms, more preferably having from 2 to 6 carbon atoms, and particularly preferably having2 carbon atoms, such as vinyl and the like), an alkynyl group (preferably having from 2 to 20 carbon atoms, more preferably having from 2 to 6 carbon atoms, and particularly preferably having 2 carbon atoms, such as vinyl and the like), an alkynyl
- substituents may further be substituted or may be condensed to other rings. Further, if there are two or more of substituents, these substituents may be the same or different from each other, or may be combined with each other to form a cyclic structure.
- the substituent is preferably an alkyl group, an aryl group, an acyl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkoxycarbonyl group, an aryloxycarbonyl group, a halogen atom, a hydroxy group, and a heterocyclic group, more preferably an alkyl group, an aryl group, a halogen atom, and a heterocyclic group, and still more preferably an alkyl group and a halogen group.
- Q 1 in the general formula (I) represents an aromatic hydrocarbon ring or an aromatic hetero ring.
- An example of the aromatic hydrocarbon ring represented by Q 1 is a benzene ring.
- Examples of the aromatic hetero ring represented by Q 1 include a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, an oxazole ring, a thiazole ring, an imidazole ring, an oxadiazole ring, a thiadiazole ring, a triazole ring, a tetrazole ring, a furan ring, a thiophene ring, a pyrrole ring, an indole ring, a benzimidazole, and an imidazopyridine ring.
- Q 1 is preferably a benzene ring, a pyridine ring, a pyrimidine ring, a pyrazine ring, a triazine ring, a thiadiazole ring, an oxadiazole ring, an imidazole ring, an indole ring, a benzimidazole ring and an imidazopyridine ring, more preferably a benzene ring, a pyridine ring, a triazine ring, a thiadiazole ring, an oxazole ring, a thiazole ring, an imidazole ring, a benzimidazole ring, and an imidazopyridine ring, and still more preferably a benzene ring, a pyridine ring, a benzimidazole ring and an imidazopyridine ring.
- the aromatic hydrocarbon ring or aromatic hetero ring represented by Q 1 may have a substituent.
- any of the examples of the substituent of L 1 can be applied.
- the substituent of Q 1 is preferably a alkyl group, an aryl group, a halogen atom, and a heterocyclic group, and more preferably an alkyl group and a halogen atom.
- n 1 in the general formula (I) represents a number of 2 or more, preferably 2 to 15, more preferably 2 to 6, and still more preferably 3 to 6.
- L A in the general formula (A-I) represents a bivalent or more coupling group.
- the coupling group represented by L A any of the specific examples of the coupling group L 1 in the general formula (I) can be applied.
- L A is preferably a bivalent or more aromatic hydrocarbon ring and a bivalent or more aromatic hetero ring, more preferably 1,3,5-benzenetriyl group, 2,4,6-pyridinetriyl group, 2,4,6-pyrimidinetriyl group, and 2,4,6-triazinetriyl group, still more preferably 1,3,5-benzenetriyl group and 2,4,6-triazinetriyl group, and particularly preferably 2, 4, 6- triazinetriyl group.
- Q A represents a group of atoms necessary for forming a nitrogen-containing aromatic hetero ring, and may have a monocyclic structure or a condensed ring structure.
- the nitrogen-containing aromatic hetero ring formed by Q A is preferably a 5- to 8-membered nitrogen-containing aromatic hetero ring, and still more preferably a 5- to 6-membered nitrogen-containing aromatic hetero ring.
- Examples of the nitrogen-containing aromatic hetero ring formed by Q A include a pyrrole ring, an imidazole ring, a triazole ring, a tetrazole ring, an oxadiazole ring, thiadiazole ring, an oxatriazole ring, a thiatriazole ring, an indole ring, a benzimidazole ring, a benzotriazole ring, an imidazopyridine ring, an imidazopyrimidine ring, and an imidazopyridazine ring, preferably a pyrrole ring, an imidazole ring, a benzimidazole ring, and an imidazopyridine ring, more preferably a benzimidazole ring and an imidazopyridine ring, and still more preferably a benzimidazole ring.
- Plural Q A may be the same or may be different from each other.
- L A and Q A in the general formula (A-I) each may have a substituent.
- substituent for example, any of the examples of the substituent of L 1 in the general formula (I) can be applied.
- n A represents a number of 2 or more, preferably 2 to 6, more preferably 2 to 3, and still more preferably 3.
- L A and n A in the general formula (A-II) each have the same meaning as those in the general formula (A-I), and a preferred embodiment thereof is also the same.
- X A21 , X A22 , X A23 , and X A24 in the general formula (A-II) each represent a nitrogen atom or C—R (R represents a hydrogen atom or a substituent), and if possible, may be combined with each other to form a ring structure.
- R represents a hydrogen atom or a substituent
- any of the examples of the substituent of L 1 in the general formula (I) can be applied.
- R is preferably a hydrogen atom, an aliphatic hydrocarbon group, a silyl group, and a ring structure formed by combination thereof, more preferably a hydrogen atom, an aliphatic hydrocarbon group, and a ring structure formed by combination thereof, and still more preferably a hydrogen atom, an alkyl group (preferably having from 1 to 16 carbon atoms, more preferably having from 1 to 12 carbon atoms, and still more preferably having from 1 to 6 carbon atoms), and a ring structure formed by combination thereof (preferably a 5- to 7-membered ring, more preferably a 5- or 6-membered ring, still more preferably a 6-membered aromatic ring, and particularly preferably a benzene ring or a pyridine ring).
- X A21 is preferably C—R.
- R is more preferably a hydrogen atom or an alkyl group, still more preferably a hydrogen atom or an unsubstituted alkyl group, and particularly preferably a hydrogen atom or a methyl group.
- X A22 is preferably a nitrogen atom.
- X A23 X A24 are each preferably C—R, and more preferably a ring structure formed by combination of X A23 and X A24 via R (preferably a 5- to 7-membered ring, more preferably a 5- or 6-membered ring, still more preferably a 6-membered ring, further more preferably a 6-membered aromatic ring, and particularly preferably a benzene ring or a pyridine ring).
- R When there are plural R, they may be the same or may be different from each other.
- L A and n A in the general formula (A-III) each have the same meaning as those in the general formula (A-I), and a preferred embodiment thereof is also the same.
- X A23 and X A24 in the general formula (A-III) each have the same meaning as those in the general formula (A-II), and a preferred embodiment thereof is also the same.
- R A represents a hydrogen atom or a substituent.
- R A is preferably a hydrogen atom or an aliphatic hydrocarbon group, more preferably a hydrogen atom or an alkyl group, still more preferably a hydrogen atom or an alkyl group having 1 to 16 carbon atoms, particularly preferably a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and most preferably a hydrogen atom or a methyl group.
- L A and n A in the general formula (A-IV) each have the same meaning as those in the general formula (A-I) , and a preferred embodiment thereof is also the same.
- R A in the general formula (A-IV) has the same meaning as that in the general formula (A-III), and a preferred embodiment thereof is also the same.
- Q A4 represents a group of atoms for forming an aromatic hydrocarbon ring or an aromatic hetero ring. Examples of the aromatic ring formed by Q A4 include a benzene ring, a pyridine ring, a pyrimidine ring, a pyridazine ring, and a triazine ring, and preferably a benzene ring and a pyridine ring.
- L A and n A in the general formula (A-V) each have the same meaning as those in the general formula (A-I) , and a preferred embodiment thereof is also the same.
- R A in the general formula (A-V) has the same meaning as that in the general formula (A-III), and a preferred embodiment thereof is also the same.
- X A51 represents a nitrogen atom or C—R X (R X represents a hydrogen atom or a substituent) .
- R X represents a hydrogen atom or a substituent
- R X is preferably a hydrogen atom, an aliphatic hydrocarbon group, and a halogen atom, more preferably a hydrogen atom, an alkyl group (preferably having from 1 to 16 carbon atoms, more preferably having from 1 to 12 carbon atoms, and still more preferably having from 1 to 6 carbon atoms) , and an aryl group (preferably having from 6 to 20 carbon atoms, more preferably having from 6 to 16 carbon atoms, and still more preferably having from 6 to 12 carbon atoms) ,still more preferably a hydrogen atom and an alkyl group, and particularly preferably a hydrogen atom.
- X A51 is preferably a nitrogen atom or CH, and particularly preferably CH.
- R A51 represents a substituent.
- R A51 is preferably an aliphatic hydrocarbon group (preferably having from 1 to 20 carbon atoms, more preferably having from 1 to 16 carbon atoms, and still more preferably having from 1 to 12 carbon atoms), an aryl group (preferably having from 6 to 20 carbon atoms, more preferably having from 6 to 16 carbon atoms, and still more preferably having from 6 to 12 carbon atoms), a halogen atom, and a cyano group, more preferably an alkyl group (preferably having from 1 to 16 carbon atoms, more preferably having from 1 to 12 carbon atoms, and still more preferably having from 1 to 6 carbon atoms) , and an aryl group (preferably having from 6 to 20 carbon atoms, more preferably having from 6 to 16 carbon atoms, and still more preferably having from 6 to 12 carbon atoms)
- an aryl group preferably having from 6 to 20 carbon atoms, more preferably having from 6 to 16 carbon atoms,
- n A51 represents an integer of 0 to 3, preferably 0 to 2, more preferably 0 or 1, and particularly preferably 0.
- the compound represented by the following general formula (A) is still more preferable.
- An azole compound represented by the general formula (A) is particularly preferably used as an organic material which constitutes a layer adjacent to the light emitting layer.
- R A1 , R A2 and R A3 in the general formula (A) each have the same meaning as R A in the general formula (A-III), and a preferred embodiment thereof is also the same. That is, R A1 , R A2 and R A3 are each preferably a hydrogen atom or an aliphatic hydrocarbon group. R A4 , R A5 and R A6 in the general formula (A) each have the same meaning as R A51 in the general formula (A-V) that is, each represent a substituent, and a preferred embodiment thereof is also the same.
- n A1 , n A2 and n A3 in the general formula (A) each have the same meaning as n A51 in the general formula (A-V), that is, each represent an integer of 0 to 3, and a preferred embodiment thereof is also the same.
- X A1 , X A2 and X A3 in the general formula (A) each have the same meaning as X A51 in the general formula (A-V), that is, each represent a nitrogen atom or C—R X (R X represents a hydrogen atom or a substituent), and a preferred embodiment thereof is also the same.
- Y A1 , Y A2 and Y A3 in the general formula (A) each represent a nitrogen atom or C—R YX (R YX represents a hydrogen atom or a substituent).
- R YX represents a hydrogen atom or a substituent.
- any of the examples of the substituent of L 1 in the general formula (I) can be applied.
- R YX is preferably a hydrogen atom, an alkyl group (preferably having from 1 to 16 carbon atoms, more preferably having from 1 to 12 carbon atoms, and still more preferably having from 1 to 6 carbon atoms), and an aryl group (preferably having from 6 to 16 carbon atoms, more preferably having from 6 to 12 carbon atoms, and still more preferably having from 6 to 10 carbon atoms) , more preferably a hydrogen atom, a methyl group, and a phenyl group, and particularly preferably a hydrogen atom.
- Y A1 , Y A2 and Y A3 are all nitrogen atoms or CH.
- R A1 , R A2 and R A3 in the general formula (A-a) each have the same meaning as that of R A in the general formula (A-III), and a preferred embodiment thereof is also the same.
- R A4 , R A5 and R A6 in the general formula (A-a) each have the same meaning as that of R A51 in the general formula (A-V), and a preferred embodiment thereof is also the same.
- n A1 , n A2 and n A3 in the general formula (A-a) each have the same meaning as that of n A51 in the general formula (A-V), and a preferred embodiment thereof is also the same.
- Y A1 , Y A2 and Y A3 in the general formula (A-a) each have the same meaning as those in the general formula (A) , and a preferred embodiment thereof is also the same.
- R A1 , R A2 and R A3 in the general formulae (A-b) and (A-c) each have the same meaning as R A in the general formula (A-III), and a preferred embodiment is also the same.
- L B in the general formula (B-I) represents a bivalent or more coupling group.
- the coupling group represented by L B any of the examples of the coupling group L 1 in the general formula (I) can be applied.
- L B is preferably a bivalent or more aromatic hydrocarbon ring and a bivalent or more aromatic hetero ring, and more preferably 1,3,5-benzenetriyl group and 2,4,6-triazinetriyl group.
- Q B in the general formula (B-I) represents atoms necessary for forming an aromatic hetero ring by bonding with C.
- the aromatic hetero ring formed by Q B is preferably a 5- to 8-membered aromatic hetero ring, more preferably a 5- to 6-membered aromatic hetero ring, and particularly preferably a 5- to 6-membered nitrogen-containing aromatic hetero ring.
- Examples of the aromatic hetero ring formed by Q B include an imidazole ring, an oxazole ring, a thiazole ring, a selenazole ring, a tellurazole ring, a triazole ring, a tetrazole ring, an oxadiazole ring, a thiadiazole ring, an oxatriazole ring, a thiatriazole ring, a pyrimidine ring, a pyridazine ring, a pyrazine ring, a triazine ring, and a tetrazine ring, preferably an imidazole ring, an oxazole ring, a thiazole ring, and a triazine ring, more preferably an imidazole ring, an oxazole ring, and a triazine ring, and still more preferably an imidazole ring and
- the aromatic hetero ring formed by Q B may also form a condensed ring with other ring, or may have a substituent.
- the substituent for example, any of the examples of the substituent of the group represented by L 1 in the general formula (I).
- the substituent of Q B is preferably an alkyl group, an aryl group, an amino group, an alkoxy group, an aryloxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyloxy group, an acylamino group, a sulfonylamino group, a sulfamoyl group, a carbamoyl group, an alkylthio group, an arylthio group, a sulfonyl group, a halogen atom, a cyano group, and a heterocyclic group, more preferably an alkyl group, an aryl group, an alkoxy group, an aryloxy group,
- n B in the general formula represents an integer of 2 or more, preferably 2 to 8, more preferably 2 to 6, still more preferably 2 to 4, particularly preferably 2 to 3, and most preferably 3.
- L B in the general formula (B-II) has the same meaning as L B in the general formula (B-I), and a preferred embodiment thereof is also the same.
- X B2 in the general formula (B-II) represents —O—, —S— or ⁇ N—R B2 .
- R B2 represents a hydrogen atom, an aliphatic hydrocarbon group, an aromatic hydrocarbon group, and an aromatic heterocyclic group.
- the aliphatic hydrocarbon group represented by R B2 is a normal chain, branching, or cyclic alkyl group (preferably having from 1 to 20 carbon atoms, more preferably having from 1 to 12 carbon atoms, and particularly preferably having from 1 to 8 carbon atoms, such as methyl, ethyl, isopropyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, and cyclohexyl) , an alkenyl group (preferably having from 2 to 20 carbon atoms, more preferably having from 2 to 12 carbon atoms, and particularly preferably having from 2 to 8 carbon atoms, such as vinyl, allyl, 2-butenyl, and 3-pentenyl), an alkynyl group (preferably having from 2 to 20 carbon atoms, more preferably having from 2 to 12 carbon atoms, and particularly preferably having from 2 to 8
- the aryl group represented by R B2 is a monocyclic or condensed-ring aryl group, that is, an aryl group preferably having from 6 to 30 carbon atoms, more preferably having from 6 to 20 carbon atoms, and still more preferably having from 6 to 12 carbon atoms.
- Examples of the aryl group include phenyl, 2-methylphenyl, 3-methylphenyl, 4-methylphenyl, 2-methoxyphenyl, 3-trifluoromethylphenyl, pentafluorophenyl, 1-naphthyl, and 2-naphthyl.
- the heterocyclic group represented by R B2 is a monocyclic or condensed-ring heterocyclic group (preferably having from 1 to 20 carbon atoms, more preferably having form 1 to 12 carbon atoms, and still more preferably having from 2 to 10 carbon atoms), preferably an aromatic heterocyclic group including at least one of a nitrogen atom, an oxygen atom, a sulfur atom, and selenium atom.
- heterocyclic group represented by R B2 examples include pyrrolidine, piperidine, piperazine, morpholine, thiophene, selenophene, furan, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, pyrimidine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, phthalazine, naphthylidine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, phenanthroline, phenazine, tetrazole, benzimidazole, benzoxazole, benzothiazole, benzotriazole, tetrazaindene, carbazole, and azepin
- the aliphatic hydrocarbon group, aryl group, and heterocyclic group represented by R B2 each may have a substituent.
- substituent any of the examples of the substituent of the group represented by L 1 in the general formula (I) can be applied, and a preferred substituent is also the same.
- R B2 is preferably an alkyl group, an aryl group, and an aromatic heterocyclic group, more preferably an aryl group and an aromatic heterocyclic group, and still more preferably an aryl group.
- X B2 is preferably —O— or ⁇ N—R B2 , more preferably ⁇ N—R B2 , and particularly preferably N—Ar B2 (Ar B2 is an aryl group (preferably having from 6 to 30 carbon atoms, more preferably from 6 to 20 carbon atoms, and still more preferably 6 to 12 carbon atoms) and an aromatic heterocyclic group (preferably having from 1 to 20 carbon atoms, more preferably having from 1 to 12 carbon atoms, and still more preferably having from 2 to 10 carbon atoms)), and preferably an aryl group).
- Ar B2 is an aryl group (preferably having from 6 to 30 carbon atoms, more preferably from 6 to 20 carbon atoms, and still more preferably 6 to 12 carbon atoms) and an aromatic heterocyclic group (preferably having from 1 to 20 carbon atoms, more preferably having from 1 to 12 carbon atoms, and still more preferably having from 2 to 10 carbon atoms)), and preferably an aryl group).
- Z B2 represents a group of atoms necessary for forming the aromatic ring.
- the aromatic ring formed by Z B2 may be any one of the aromatic hydrocarbon ring and the aromatic hetero ring.
- the aromatic ring includes a benzene ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, a pyrrole ring, a furan ring, a thiophene ring, a selenophene ring, tellurophene ring, an imidazole ring, a thiazole ring, a selenazole ring, a tellurazole ring, a thiadiazole ring, an oxadiazole ring, and a pyrazole ring, preferably a benzene ring, a pyridine ring, a pyrazine ring,
- the aromatic ring formed by Z B2 may also form a condensed ring with other ring, or may have a substituent.
- substituent for example, any of the examples of the substituent of the group represented by L 1 in the general formula (I) can be applied.
- the substituent of the aromatic ring formed by Z B2 is preferably an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an amino group, an alkoxy group, an aryloxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyloxy group, an acylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, a sulfonylamino group, a sulfamoyl group, a carbamoyl group, an alkylthio group, an arylthio group, a sulfonyl group, a halogen atom, a cyano group, and a heterocyclic group, more preferably an alkyl group, an aryl group, an alkoxy group, an aryloxy group, a halogen atom, a cyano group, and a hetero
- L B in the general formula (B-III) has the same meaning as that in the general formula (B-I), and a preferred embodiment thereof is also the same.
- X B3 and n B3 in the general formula (B-III) respectively have the same meanings as X B2 and n B2 in the general formula (B-II) , and a preferred embodiment thereof is also the same.
- Z B3 represents a group of atoms necessary for forming the aromatic hetero ring.
- the aromatic hetero ring formed by Z B3 is preferably a 5- or 6-membered aromatic hetero ring, more preferably a 5- or 6-membered nitrogen-containing aromatic hetero ring, and still more preferably a 6-membered nitrogen-containing aromatic hetero ring.
- Examples of the aromatic hetero ring formed by Z B3 include furan, thiophene, pyran, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyrimidine, pyridazine, triazine, thiazole, oxazole, isothiazole, isoxazole, thiadiazole, oxadiazole, triazole, selenazole, and tellurazole, preferably pyridine, pyrazine, pyrimidine, and pyridazine, more preferably pyridine and pyrazine, and still more preferably pyridine.
- the aromatic hetero ring formed by Z B3 may also form a condensed ring with other ring, or may have a substituent.
- substituent any of the examples of the substituents of the group represented by L 1 in the general formula (I) can be applied, and a preferred embodiment thereof is also the same.
- L B in the general formula (B-IV) has the same meaning as that in the general formula (B-I), and a preferred embodiment thereof is also the same.
- X B4 and n B4 in the general formula (B-IV) respectively have the same meanings as X B2 and n B2 in the general formula (B-II), and a preferred embodiment thereof is also the same.
- Z B4 represents a group of atoms required for forming a nitrogen-containing aromatic hetero ring.
- the nitrogen-containing aromatic hetero ring formed by Z B4 is preferably a 5- or 6-membered nitrogen-containing aromatic hetero ring, and more preferably a 6-membered nitrogen-containing aromatic hetero ring.
- Examples of the nitrogen-containing aromatic hetero ring formed by Z B4 include pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyrimidine, pyridazine, triazine, thiazole, oxazole, isothiazole, isoxazole, thiadiazole, oxadiazole, triazole, selenazole, and tellurazole, preferably pyridine, pyrazine, pyrimidine, and pyridazine, more preferably pyridine and pyrazine, and still more preferably pyridine.
- the aromatic hetero ring formed by Z B4 may also form a condensed ring with other ring, or may have a substituent.
- substituent any of the examples of the substituents of the group represented by L 1 in the general formula (I) can be applied, and a preferred embodiment thereof is also the same.
- L B in the general formula (B-V) has the same meaning as that in the general formula (B-I), and a preferred embodiment thereof is also the same.
- X B5 and n B5 in the general formula (B-V) respectively have the same meanings as X B2 and n B2 in the general formula (B-II) , and a preferred embodiment thereof is also the same.
- Z B5 represents a group of atoms necessary for forming the 6-membered nitrogen-containing aromatic hetero ring.
- Examples of the 6-membered nitrogen-containing aromatic hetero ring formed by Z B5 include pyridine, pyrazine, pyrimidine, pyridazine, and triazine, preferably pyridine, pyrazine, pyrimidine, and pyridazine, more preferably pyridine and pyrazine, and still more preferably pyridine.
- the 6-membered nitrogen-containing aromatic hetero ring formed by Z B5 may also form a condensed ring with other ring, or may have a substituent.
- substituent any of the examples of the substituents of the group represented by L 1 in the general formula (I) can be applied, and a preferred embodiment thereof is also the same.
- L B in the general formula (B-VI) has the same meaning as that in the general formula (B-I) , and a preferred embodiment thereof is also the same.
- X B6 and n B6 in the general formula (B-VI) respectively have the same meanings as X B2 and n B2 in the general formula (B-II) , and a preferred embodiment thereof is also the same.
- Z B6 in the general formula (B-VI) has the same meaning as Z B5 in the general formula (B-V), and a preferred embodiment thereof is also the same.
- R B6 in the general formula (B-VI) has the same meaning as R B B2 in the general formula (B-II) , and a preferred embodiment thereof is also the same.
- R B71 , R B72 and R B73 in the general formula (B-VII) each have the same meaning as R B2 in the general formula (B-II), and a preferred embodiment thereof is also the same.
- Z B71 , Z B72 , and Z B73 in the general formula (B-VII) each have the same meaning as Z B5 in the general formula (B-V), and a preferred embodiment thereof is also the same.
- L B71 , L B72 , and L B73 in the general formula (B-VII) each represent a coupling group, and may be each any of the examples of L 1 in the general formula (I).
- L B71 , L B72 , and L B73 in the general formula (B-VII) are each a coupling group comprised of, preferably single bond, bivalent aromatic hydrocarbon ring group, bivalent aromatic heterocyclic group, and a combination thereof, and more preferably single bond.
- L B71 , L B72 , and L B73 may each have a substituent.
- any of substituents of the group represented by L 1 in the general formula (I), and a preferred embodiment thereof is also the same.
- Y in the general formula (B-VII) represents a nitrogen atom, 1,3,5-benzenetriyl group, or 2,4,6-triazinetriyl group.
- 1,3,5-benzenetriyl group may have a substituent at the position of 2,4,6.
- the substituent for example, an alkyl group, an aromatic hydrocarbon ring group, and a halogen atom can be applied.
- R B81 , R B82 and R B83 in the general formula (B-VIII) each have the same meaning as R B2 in the general formula (B-II), and a preferred embodiment thereof is also the same.
- Z B81 , Z B82 , and Z B83 in the general formula (B-VIII) each have the same meaning as Z B5 in the general formula (B-V), and a preferred embodiment thereof is also the same.
- R B91 , R B92 , and R B93 in the general formula (B-IX) each have the same meaning as R B2 in the general formula (B-II), and a preferred embodiment thereof is also the same.
- R B94 , R B95 , and R B96 in the general formula (B-IX) each represent a substituent.
- any of substituents of the group represented by L 1 in the general formula (I) can be applied, and a preferred embodiment thereof is also the same. Further, if possible, the substituents may be coupled to form a ring.
- p1, p2, and p3 in the general formula (B-IX) each represent an integer of 0 to 3, preferably 0 to 2, more preferably 0 or 1, and still more preferably 0.
- Q C1 represents an aromatic hydrocarbon ring or an aromatic hetero ring.
- Examples of the aromatic hydrocarbon ring represented by Q C1 are a benzene ring and a naphthalene ring.
- Examples of the aromatic hetero ring represented by Q C1 are a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, an oxazole ring, a thiazole ring, an imidazole ring, an oxadiazole ring, a thiadiazole ring, a triazole ring, a tetrazole ring, a furan ring, a thiophene ring, and pyrrole ring.
- Q C1 is preferably a benzene ring, a pyridine, ring, a pyrazine ring, a triazine ring, a thiadiazole ring, and an oxadiazole ring, more preferably a benzene ring, a pyridine ring, a triazine ring, and a thiadiazole ring, and still more preferably a benzene ring and a triazine ring.
- the aromatic hydrocarbon ring or aromatic hetero ring represented by Q C1 may be condensed with other ring, or may have a substituent.
- any of substituents of the group represented by L 1 in the general formula (I) can be applied, and a preferred embodiment thereof is also the same.
- R C1 represents a hydrogen atom or an aliphatic hydrocarbon group.
- R C1 is preferably an aliphatic hydrocarbon group, and more preferably an alkyl group and an alkenyl group.
- n c represents an integer of 2 to 4, preferably 3 or 4, and more preferably 4. At this time, if n c is 2, Q C1 of the same kind may be bonded to Si, or Q C1 of different two kinds may be bonded to Si.
- Q C21 , Q C22 , Q C23 , and Q C24 in the general formula (C-II) each have the same meaning as Q C1 in the general formula (C-I), and a preferred embodiment thereof is also the same.
- Q C21, Q 22 , Q C23 , and Q C24 in the general formula (C-II) may be the same or may be different from one another.
- Q D1 represents an aromatic hydrocarbon ring or an aromatic hetero ring.
- An example of the aromatic hydrocarbon ring represented by Q D1 is a benzene ring.
- Examples of the aromatic hetero ring represented by Q D1 are a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, an oxazole ring, a thiazole ring, an imidazole ring, an oxadiazole ring, a thiadiazole ring, a triazole ring, a tetrazole ring, a furan ring, a thiophene ring, and pyrrole ring.
- Q D1 is preferably a benzene ring, a pyridine, ring, a pyrazine ring, a triazine ring, a thiadiazole ring, and an oxadiazole ring, more preferably a benzene ring, a pyridine ring, a triazine ring, and a thiadiazole ring, and still more preferably a benzene ring and a triazine ring.
- the aromatic hydrocarbon ring or aromatic hetero ring represented by Q D1 may be condensed with other ring, or may have a substituent.
- any of substituents of the group represented by L 1 in the general formula (I) can be applied, and a preferred embodiment thereof is also the same.
- R D1 represents a hydrogen atom or an aliphatic hydrocarbon group.
- R D1 is preferably an aliphatic hydrocarbon group, and more preferably an alkyl group and an alkenyl group.
- n D represents an integer of 2 to 4, preferably 3 or 4, and more preferably 4. At this time, if n D is 2, Q D1 of the same kind may be bonded to C, or Q D1 of the different two kinds may be bonded to C.
- Q D21 , Q D22 , Q D23 , and Q D24 in the general formula (D-II) each have the same meaning as Q D1 in the general formula (D-I), and a preferred embodiment thereof is also the same.
- Q D21 , Q D22 , Q D23 , and Q D24 in the general formula (D-II) may be the same or may be different from one another.
- the host material used in the present invention and the organic material contained in the layer which is disposed adjacent to the light emitting layer each may be a polymer (having a weight average molecular weight of preferably 1000 to 5000000, more preferably 2000 to 2000000, and still more preferably 10000 to 1000000) with a skeleton represented by the general formula (I) or the general formula (II) being connected to a polymer main chain, or a high molecular weight compound (having a weight average molecular weight of preferably 1000 to 5000000, more preferably 2000 to 2000000, and still more preferably 10000 to 1000000) having, as the main chain, a skeleton represented by the general formula (I) or the general formula (II).
- a polymer having a weight average molecular weight of preferably 1000 to 5000000, more preferably 2000 to 2000000, and still more preferably 10000 to 1000000
- a high molecular weight compound having, as the main chain, a skeleton represented by the general formula (I) or the general formula
- the polymer may be a homopolymer or a copolymer having other skeleton connected thereto.
- the copolymer may be a random copolymer or a block copolymer.
- the host material used in the present invention and the organic material contained in the layer which is disposed adjacent to the light emitting layer are each preferably a low molecular weight compound or a polymer with the skeleton represented by the general formula (I) or the general formula (II) being connected to a polymer main chain, and more preferably a low molecular weight compound.
- the host material used in the present invention and the organic material contained in the layer which is disposed adjacent to the light emitting layer may be compounds in which the skeleton represented by the general formula (I) or the general formula (II) is connected to a metal to form a complex.
- Exemplified compounds A-1 to A-33 are specific examples of the general formula (A-I)
- exemplified compounds B-1 to B-62 are specific examples of the general formula (B-I)
- exemplified compounds C-1 to C-72 are specific examples of the general formula (C-I)
- exemplified compounds D-1 to D-75 are specific examples of the general formula (D-I)
- exemplified compounds E-1 to E-5 are other specific examples.
- Weight average molecular weight 14100 (converted into polystyerene)
- Weight average molecular weight 21,000 (converted into polystyrene)
- Weight average molecular weight 14,000 (converted into polystyrene)
- Weight average molecular weight 12100 (converted into polystyrene)
- Weight average molecular weight 3200 (converted into polystyrene)
- Weight average molecular weight 4200 (converted into polystyrene)
- a reaction solution was poured into 300 ml of water and a solid matter thus deposited was filtered out and washed with water.
- the aforementioned luminescent material contains at least one compound having a light emission maximum wavelength from an exciton in the blue region.
- the light emission in the blue region is derived from a transition from the minimum exciton triplet energy (T 1 ) to the ground state.
- the light emitting material include transition metal complexes.
- these complexes iridium complexes, osmium complexes and platinum complexes are preferable in the point that these complexes have a high phosphorescence quantum yield and furhter improve the external quantum efficiency of the light emitting element. Iridium complexes and platinum complexes are more preferable and orthometalated iridium complexes are most preferable.
- Examples of preferred transition metal complexes include compounds described in Japanese Patent Application Nos. 11-370353, 2000-287177, 2000-28178, 2000-299495, 2000-398907, 2001-33684, and 2001-45476.
- the following compounds exemplified compounds K-1 to K-9 are given; however, light emitting materials used in the present invention are not limited to these examples.
- the aforementioned host material provides a field for the recombination of injected holes and electrons and also has the ability to transfer the energy of an exciton generated by the recombination to the guest.
- the host material are materials having a carbazole skeleton, materials having a diarylamine skeleton, materials having a pyridine skeleton, materials having a pyrazine skeleton, materials having a triazine skeleton and materials having an arylsilane skeleton.
- the light emitting layer may be formed by doping the host material with the light emitting material.
- the light emitting layer may be formed by co-depositing the light emitting material and the host material.
- the light emitting layer maybe formed by utilizing a vacuum deposition method, LB method, ink jet method, printing method, transfer method or coating method (e.g., a spin coating method, casting method, dip coating method, or the like) .
- the use of the aforementioned coating method is advantageous in reducing production costs.
- the coating method conventionally poses the problem that a light emitting element utilizing the above coating method is inferior in emission illuminance and luminance efficiency to those produced by a deposition method or the like.
- the layer disposed adjacent to the light emitting layer is formed of an organic material satisfying the above requirements,the luminance efficiency is improved. Therefore, a light emitting element having good luminance efficiency can be provided at low cost by producing this light emitting element utilizing the coating method.
- a coating solution in which the light emitting material is dissolved in a solvent, is prepared and the coating solution is applied to a desired position to form the light emitting layer.
- a resin may be dissolved or dispersed in the solvent together with the light emitting material to prepare the coating solution.
- the resin are polyvinyl chloride, polycarbonate, polystyrene, polymethyl methacrylate, polybutyl methacrylate, polyester, polysulfone, polyphenylene oxide, polybutadiene, poly(N-vinylcarbazole), hydrocarbon resins, ketone resins, phenoxy resins, polyamide, ethyl cellulose, polyvinyl acetate, ABS resins, polyurethane, melamine resins, unsaturated polyester resins, alkyd resins, epoxy resins, silicone resins, and the like.
- a film thickness of the light emitting layer is generally preferably 1 nm to 5 ⁇ m, more preferably 5 nm to 1 ⁇ m and still more preferably 10 nm to 500 nm, though no particular limitation is imposed on the thickness.
- the weight ratio of the light emitting material to the host material is generally from 0.1% by weight to 20% by weight, preferably from 0.5% by weight to 15% by weight, and more preferably from 1.0% by weight to 10% by weight.
- Materials used for the hole injecting layer and hole transporting layer have the ability to inject holes from an anode and to transport holes, respectively. These materials preferably have the ability to block electrons injected from a cathode in addition to the above abilities.
- hole transporting material and hole injecting material include carbazole derivatives, imidazole derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino substituted calcon derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, silazane derivatives, aromatic tertiary amine compounds, styrylamine derivatives, aromatic dimethylidyne derivatives, porphyrin derivatives, polysilane derivatives, poly(N-vinylcarbazole) derivatives, aniline type copolymers, thiophene oligomers, electroconductive polymers and oligomers such as polythiophene, organic silane derivatives and organic phosphine derivatives.
- the hole injecting layer and hole transporting layer may have either a monolayer structure comprising one or two types selected from the above materials or a multilayer structure comprising plural layers having the same compositions or different compositions.
- the T 1 level of the hole transporting material or hole injecting material is preferably higher than the T 1 level of the light emitting material.
- the T 1 level of the hole transporting material or hole injecting material is preferably more than 1.05 times and more preferably more than 1.1 times the T 1 level of the light emitting material.
- the T 1 level of the hole transporting material or hole injecting material is preferably from 68 kcal/mol (284.9 kJ/mol) to 90 kcal/mol (377.1 kJ/mol), more preferably from 69 kcal/mol (289.1 kJ/mol) to 85 kcal/mol (356.2 kJ/mol) and still more preferably from 70 kcal/mol (293.3 kJ/mol) to 80 kcal/mol (335.2 kJ/mol).
- the T 1 level of each of all hole transporting materials and hole injecting materials contained in the multilayer is preferably higher than the T 1 level of the light emitting material.
- Examples of a method of forming the hole injecting layer and the hole transporting layer include a vacuum deposition method, LB method, ink jet method, printing method, coating method (e.g., a spin coating method, casting method, dip coating method and the like), and transfer method similarly to the method of forming the light emitting layer.
- a coating solution to be used for the coating method is prepared, a resin may be used.
- the resin include the same resins that are exemplified as being usable for the preparation of the coating solution used in the formation of the light emitting layer.
- a film thickness of each of the hole injecting layer and the hole transporting layer is preferably 1 nm to 5 ⁇ m, more preferably 5 nm to 1 ⁇ m and still more preferably 10 nm to 500 nm in general, though there is no particular limitation to the thickness.
- Materials used for the electron injecting layer and the electron transporting layer have the ability to inject electrons from a cathode and to transport electrons, respectively. These materials preferably have the ability to block holes injected from an anode in addition to the above abilities.
- the electron injecting material and electron transporting material include various metal complexes represented by metal complexes of imidazole derivatives, triazole derivatives, triazine derivatives, oxazole derivatives, oxadiazole derivatives, fluorenone derivatives, anthraquinodimethane derivatives, anthrone derivatives, diphenylquinone derivatives, thiopyranedioxide derivatives, carbodiimide derivatives, fluorenylidenemethane derivatives, distyrylpyrazine derivatives, cyclic tetracarboxylic acid of aromatic compound such as perylene and naphthalene, phthalocyanine derivatives or 8-quinolinol derivatives and by metal complexes containing metal phthalocyanine, benzoxazole or benzothiazole as a ligand and organosilane derivatives.
- the electron injecting layer and electron transporting layer may have either a monolayer structure comprising one
- the T 1 level of the electron transporting material or electron injecting material is preferably higher than the T 1 level of the light emitting material.
- the T 1 level of the electron transporting material or electron injecting material is preferably more than 1.05 times and more preferably more than 1.1 times the T 1 level of the light emitting material.
- the T 1 level of the electron transporting material or electron injecting material is preferably from 68 kcal/mol (284.9 kJ/mol) to 90 kcal/mol (377.1kJ/mol), more preferably from 69 kcal/mol (289.1 kJ/mol) to 85 kcal/mol (356.2 kJ/mol) and still more preferably from 70 kcal/mol (293.3 kJ/mol) to 80 kcal/mol (335.2 kJ/mol)
- the T 1 level of each of all electron transporting materials and electron injecting materials contained in the multilayer is preferably higher than the T 1 level of the light emitting material.
- Examples of a method of forming the electron injecting layer and the electron transporting layer include a vacuum deposition method, LB method, ink jet method, printing method, coating method (e.g., a spin coating method, casting method, dip coating method and the like), and transfer method similarly to the method of forming the light emitting layer.
- a coating solution to be used for the coating method is prepared, a resin may be used.
- the resin include the same resins that are exemplified as being usable for the preparation of the coating solution used in the formation of the light emitting layer.
- a film thickness of each of the electron injecting layer and the electron transporting layer is preferably 1 nm to 5 ⁇ m, more preferably 5 nm to 1 ⁇ m and still more preferably 10 nm to 500 nm in general, though there is no particular limitation to the thickness.
- Materials for the protective layer may be those having the ability to prevent the intrusion of a material, such as water and oxygen promoting elemental deterioration, into the element.
- a material such as water and oxygen promoting elemental deterioration
- Specific examples of such a material include metals such as In, Sn, Pb, Au, Cu, Ag, Al, Ti and Ni, metal oxides such as MgO, SiO, SiO 2 , Al 2 O 3 , GeO, NiO, CaO, BaO, Fe 2 O 3 , Y 2 O 3 and TiO 2 , nitrides such as SiN x and SiN x O y , metal fluorides such as MgF 2 , LiF, AlF 3 and CaF 2 , polyethylene, polypropylene, polymethyl methacrylate, polyimide, polyurea, polytetrafluoroethylene, polychlorotrifluoroethylene, polydichlorodifluoroethylene, copolymers of chlorotrifluoroethylene
- a method of forming the protective layer for example, a vacuum deposition method, sputtering method, reactive sputtering method, MBE (molecular beam epitaxy) method, cluster ion beam method, ion plating method, plasma polymerization method (high frequency excitation ion plating method), plasma CVD method, laser CVD method, thermal CVD method, gas source CVD method, coating method, ink jet method, printing method, and transfer method may be applied.
- a vacuum deposition method for example, a vacuum deposition method, sputtering method, reactive sputtering method, MBE (molecular beam epitaxy) method, cluster ion beam method, ion plating method, plasma polymerization method (high frequency excitation ion plating method), plasma CVD method, laser CVD method, thermal CVD method, gas source CVD method, coating method, ink jet method, printing method, and transfer method may be applied.
- Materials constituting the anode serves to supply holes to the hole injecting layer, hole transporting layer and light emitting layer.
- a metal, alloy, metal oxide, electroconductive compound or a mixture of these materials may be used.
- Preferable materials are those having a working function of 4 eV or more.
- these materials include conductive metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO) , metals such as gold, silver, chromium and nickel, mixtures or laminates of these metals and conductive metal oxides, inorganic conductive materials such as copper iodide and copper sulfide, organic conductive materials such as polyaniline, polythiophene and polypyrrole and laminates of these materials and ITO.
- conductive metal oxides are preferable and ITO is particularly preferable in view of productivity, high conductivity and transparency.
- a film thickness of the anode may be selected optionally according to the type of material, it is in a range preferably from 10 nm to 5 ⁇ m, more preferably from 50 nm to 1 ⁇ m and still more preferably from 100 nm to 500 nm in general.
- an electrode obtained by forming a layer on soda lime glass, non-alkali glass and a transparent resin substrate is usually used.
- non-alkali glass is preferably used as the glass material to decrease the elution of ions from the glass.
- soda lime glass glass which is coated with silica as a barrier is preferably used.
- a substrate having a thickness of generally 0.2 mm or more and preferably 0.7 mm or more is used when glass is used.
- various methods are used according to the type of material. In a case of, for example, ITO, a film is formed using a method such as an electron beam method, sputtering method, resistance heating deposition method, chemical reaction method (sol-gel method) and method of applying a dispersion of ITO.
- the driving voltage for the light emitting element can be reduced and the luminance efficiency can be raised by performing treatments such as washing and other treatments of the anode. For example, in a case of ITO, UV-ozone treatment and plasma treatment are effective.
- a material constituting the cathode serves to supply electrons to the electron injecting layer, electron transporting layer, light emitting layer and the like and is selected in consideration of adhesion to the layers, such as the electron injecting layer, electron transporting layer and light emitting layer, disposed adjacent thereto, ionizing potential and stability.
- a metal, alloy, metal oxide, electroconductive compound or mixture of these materials may be used as the material of the cathode.
- alkali metals e.g., Li, Na, K, Cs and the like
- alkali earth metals e.g., Mg and Ca
- fluorides or oxides of these compounds gold, silver, lead, aluminum, sodium-potassium alloys or mixtures of this alloy and other metal, lithium-aluminum alloys or mixtures of this alloy and other metal, magnesium-silver alloys or mixtures of this alloy and other metal and rare earth metals such as indium and ytterbium.
- Materials having a working function of 4 eV or less are preferable and aluminum, lithium-aluminum alloys or mixtures of this alloy and other metal and magnesium-silver alloys or mixtures of this alloy and other metal are more preferable.
- the cathode has a film thickness ranging preferably from 10 nm to 5 ⁇ m, more preferably from 50 nm to 1 ⁇ m and more preferably 100 nm to 1 ⁇ m in general.
- the cathode is formed using a method such as an electron beam method, sputtering method, resistance heating deposition method and coating method.
- a metal can be deposited singly and two or more metal components may be deposited simultaneously. Moreover, plural metals may be deposited at the same time to form an alloy electrode. Also, an alloy prepared in advance may be deposited.
- the sheet resistance of each of the anode and the cathode be lower and preferably several hundreds ⁇ / ⁇ or less.
- the light emitting element of the present invention may be served to applications in wide fields such as display elements, displays, back-up lights, electrophotographs, illumination light sources, recording light sources, reading light sources, beacons, signboards, interiors, and optical communication devices.
- a patterned mask (the emission area was designed to be 4 mm ⁇ 5 mm) was placed on the organic thin film to co-deposit magnesium/silver (10:1) in a thickness of 250 nm. Thereafter, silver was deposited in a thickness of 300 nm to produce a light emitting element.
- a light emitting element was produced in the same manner as in Example 1 except that the exemplified compound A-10 was used in place of CBP in the manufacturing of the light emitting element of Example 1.
- a light emitting element was produced in the same manner as in Example 1 except that TPD(N,N′-diphenyl-N,N′-di(m-tolyl)-benzidine) was used in place of ⁇ -NPD in the manufacturing of the light emitting element of Example 1.
- a light emitting element was produced in the same manner as in Example 2 except that TPD was used in place of ⁇ -NPD in the manufacturing of the light emitting element of Example 2.
- a light emitting element was produced in the same manner as in Example 4 except that the exemplified compound D-46 was used in place of the exemplified compound A-10 in the manufacturing of the light emitting element of Example 4.
- a light emitting element was produced in the same manner as in Example 4 except that the exemplified compound C-71 was used in place of the exemplified compound A-10 in the manufacturing of the light emitting element of Example 4.
- a light emitting element was produced in the same manner as in Example 3 except that the exemplified compound K-3 was used in place of the exemplified compound K-1 in the manufacturing of the light emitting element of Example 3.
- a light emitting element was produced in the same manner as in Example 4 except that the exemplified compound K-3 was used in place of the exemplified compound K-1 in the manufacturing of the light emitting element of Example 4.
- a light emitting element was produced in such a manner that in the manufacturing of the light emitting element of Example 4, the exemplified compound A-19 was used in place of the exemplified compound B-40 to form an organic thin film, and a pattern mask (the emission area was designed to be 4 mm ⁇ 5 mm) was placed on the organic thin film to deposit lithium fluoride in a thickness of 3 nm, and thereafter, aluminum was deposited in a thickness of 400 nm.
- a light emitting element was produced in the same manner as in Example 9 except that the exemplified compound K-3 was used in place of the exemplified compound K-1 in the manufacturing of the light emitting element of Example 9.
- a light emitting element was produced in the same manner as in Example 1 except that TPD was used in place of CBP in the manufacturing of the light emitting element of Example 1.
- a light emitting element was produced in the same manner as in Comparative Example 1 except that TPD was used in place of ⁇ -NPD and the exemplified compound K-3 was used in place of the exemplified example K-1 in the manufacturing of the light emitting element of Comparative Example 1.
- T 1 of each of CBP, exemplified compounds A-10, D-46, and C-71, TPD, ⁇ -NPD, exemplified compounds K-1, K-3, B-40, and A-19, which were used in Examples and Comparative Examples was measured.
- a fixed d.c. voltage was applied to each of the light emitting elements obtained in Examples and Comparative Examples by using Source Measure Unit 2400 manufactured by Toyo Technica, making each element emit light to measure the luminance by using a luminance meter BM-8 manufactured by Topcon and the light emission wavelength and CIE chromaticity coordinate by using a Spectrum Analizer PMA-11 manufactured by Hamamatsu Photonics.
- Example 1 Light emitting layer Light External Light Hole Light Electron emission quantum emitting transporting T 1 T 1 emitting T 1 transporting T 1 wavelength efficiency Element material (kcal/mol) Host (kcal/mol) material (kcal/mol) material (kcal/mol) (nm) (%)
- Example 1 ⁇ -NPD 50 CBP 66 K-1 63 B-40 66 486 5.8
- Example 2 ⁇ -NPD 50 A-10 71 K-1 63 B-40 66 487 14.5
- Example 3 TPD 58 CBP 66 K-1 63 B-40 66 486 10.9
- Example 4 TPD 58 A-10 71 K-1 63 B-40 66 486 16.5
- Example 5 TPD 58 D-46 69 K-1 63 B-40 66 486 9.6
- Example 6 TPD 58 C-71 70 K-1 63 B-40 66 487 8.9
- Example 7 TPD 58 CBP 66 K-3 64 B-40 66 474 9.7
- Example 8 TPD 58 A-10
- the T 1 level of the material used to form the layer containing the light emitting material and/or the layer adjacent to the light emitting layer is made higher than the T 1 level of the light emitting material. This makes it possible to produce a light emitting element which can emit light with high efficiency. Also, the T 1 level of the material used to form the layer containing the light emitting material and/or the layer adjacent to the light emitting layer is made higher than 70 kcal/mol (293.3 kJ/mol) or more. This makes it possible to produce a light emitting element which can emit light with higher efficiency.
- a washed ITO substrate was placed in an evaporating apparatus and TPD was deposited on the substrate in a thickness of 50 nm.
- CBP biscarbazolylbenzidine
- the compound R-1 were co-deposited thereon in a ratio of 1:17 in a thickness of 30 nm.
- the exemplified compound A-10 and exemplified compound K-3 were further co-deposited thereon in a ratio of 1:17 in a thickness of 2 nm, and the exemplified compound A-19 was still further deposited thereon in a thickness of 36 nm.
- a patterend mask (the emission area was designed to be 4 mm ⁇ 5 mm) was placed on the organic thin film to deposit lithium fluoride in a thickness of 3 nm. Thereafter, aluminum was deposited in a thickness of 400 nm to produce a light emitting element.
- a fixed d.c. voltage was applied to the light emitting element obtained in Example 11 by using Source Measure Unit 2400 manufactured by Toyo Technica, making each element emit light to measure the illuminance by using a luminance meter BM-8 manufactured by Topcon and the light emission wavelength and CIE chromaticity coordinate by using a Spectrum Analizer PMA-11 manufactured by Hamamatsu Photonics.
- the light emitting element using the compounds of the present invention can emit light with a high efficiency exceeding 15% even in a white light emitting element having conventionally emitted light with lower efficiency, and a light emitting element which can emit light of white having excellent color purity can be produced.
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US6962755B2 (en) | 2005-11-08 |
ATE482476T1 (de) | 2010-10-15 |
EP1175128A3 (en) | 2002-07-31 |
DE60143106D1 (de) | 2010-11-04 |
US20100044638A1 (en) | 2010-02-25 |
US7838131B2 (en) | 2010-11-23 |
EP1175128B1 (en) | 2010-09-22 |
EP1175128A2 (en) | 2002-01-23 |
US20050260452A1 (en) | 2005-11-24 |
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US7632579B2 (en) | 2009-12-15 |
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